EP3566032A1 - Transmetteur de valeur limite de température - Google Patents

Transmetteur de valeur limite de température

Info

Publication number
EP3566032A1
EP3566032A1 EP17821512.5A EP17821512A EP3566032A1 EP 3566032 A1 EP3566032 A1 EP 3566032A1 EP 17821512 A EP17821512 A EP 17821512A EP 3566032 A1 EP3566032 A1 EP 3566032A1
Authority
EP
European Patent Office
Prior art keywords
phase transition
temperature
unit
reference element
max
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP17821512.5A
Other languages
German (de)
English (en)
Inventor
Marc Schalles
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Endress and Hauser Wetzer GmbH and Co KG
Original Assignee
Endress and Hauser Wetzer GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Endress and Hauser Wetzer GmbH and Co KG filed Critical Endress and Hauser Wetzer GmbH and Co KG
Publication of EP3566032A1 publication Critical patent/EP3566032A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K3/00—Thermometers giving results other than momentary value of temperature
    • G01K3/005—Circuits arrangements for indicating a predetermined temperature
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/32—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using change of resonant frequency of a crystal
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/36—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using magnetic elements, e.g. magnets, coils
    • G01K7/38—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using magnetic elements, e.g. magnets, coils the variations of temperature influencing the magnetic permeability
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/34—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using capacitative elements
    • G01K7/343—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using capacitative elements the dielectric constant of which is temperature dependant

Definitions

  • the invention relates to a system for monitoring a predeterminable temperature comprising a monitoring unit and a detection unit, and to a method for monitoring a predeterminable temperature. So it's basically one
  • Temperature limit value transmitter By means of the system according to the invention can be monitored whether a predetermined temperature, such as a measuring medium, a substance or mixture of substances, or an object, such as a component, or a
  • the temperature can be determined continuously by means of a thermometer within a certain temperature range for which the thermometer is designed.
  • Thermometers are available in a wide variety of designs. Thus, there are thermometers which use the expansion of a liquid, a gas or a solid having a known coefficient of expansion for measuring the temperature, or also those which relate the electrical conductivity of a material with the temperature, such as when using resistance elements or thermocouples , In contrast, in radiation thermometers, esp. Pyrometers, to determine the temperature of a substance whose heat radiation is utilized.
  • thermometers esp. Pyrometers
  • a wide variety of physical and / or chemical specific temperature-dependent material properties can be used to determine a temperature. This can either be a change in the respective properties which occurs at a specific characteristic temperature point, in particular abrupt, or a continuous change in this property, for example in the form of a characteristic curve.
  • the Curie temperature of a ferromagnetic material is a characteristic temperature point for this material.
  • DE4032092C2 has disclosed a method for determining the Curie temperature, in which an abrupt change in the amount of heat absorbed by means of a differential scanning thermal analyzer is detected in the region of the Curie temperature.
  • DE 1977014A1 describes a device and a method for measuring the temperature of a rotating carrier part with a temperature sensor which has a ferromagnetic or paramagnetic material which is interesting in each case
  • the DE04006885A1 is concerned with the non-contact temperature measurement moving, preferably rotating body.
  • a LC combination which in an embodiment includes a ferroelectric dielectric, attached and the
  • a characteristic curve of the temperature-dependent polarization is used to determine the temperature.
  • DE102013019839A1 describes a temperature sensor with a sensor element for the passive determination of the temperature using the temperature dependence of
  • Permittivity of at least one ferroelectric material The temperature measurement takes place on the basis of transit time differences within the sensor element. From DE010258845A1 finally a temperature measuring device with a capacitive element and a dielectric material electrically contacted therein, which changes its dielectric properties with temperature, has become known.
  • thermometer properties are basically also suitable for calibration and / or validation of thermometers.
  • a device and a method for in situ calibration of a thermometer with a temperature sensor and a reference element for calibrating the temperature sensor have become known, wherein the reference element at least partially consists of a ferroelectric material, which in the relevant temperature range for the calibration of the temperature sensor
  • Phase transformation undergoes at least one predetermined temperature.
  • the calibration is thus carried out on the basis of the characteristic temperature point of a phase transition of a ferroelectric material, ie on the basis of a material-specific property.
  • a so-called 1-point and a multi-point calibration and / or validation can be carried out in this way.
  • a similar, in particular for multipoint calibrations suitable device is further from the hitherto unpublished German patent application with the file number
  • thermometer described therein comprises at least one temperature sensor and at least two reference elements contacted via exactly two connecting wires, which at least partially consist of two different materials, for which materials in each case are relevant for the calibration of the temperature sensor
  • Temperature range occurs at least one phase transition at least second order at each of a predetermined phase transition temperature.
  • DE102006031905A1 has disclosed a device for determining and / or monitoring at least one process variable of a medium with a sensor unit, a housing and a temperature exceeding element.
  • the temperature exceeding element is mounted in or on the housing and comprises a piezoelectric element, wherein the Curie temperature of the piezoelectric element is selected such that the Curie temperature in the region of
  • Temperaturschreibschreitungselement be removed from the housing, or be configured such that the polarization of the temperature exceeding element in the installed state can be queried. This requires a special embodiment of the respective measuring device.
  • the present invention seeks to provide a simple and universally applicable way, by means of which
  • a monitoring unit comprising a reference element, which
  • Reference element consists at least partially of a material for which material at a phase transition temperature, which phase transition temperature is in the range of the predetermined temperature, at least one phase transition occurs, for which phase transition the material remains in the solid phase, and a detection unit, which is designed to Occurrence of
  • Phase transition on the basis of a, in particular abrupt, change to detect at least one characteristic of the reference element physical or chemical characteristic and to generate a message on the exceeding or falling below the predetermined temperature.
  • a temperature limit value transmitter By means of the system according to the invention can be monitored in a simple manner, whether a predetermined temperature, for example, a measuring medium, a substance or mixture of substances, or an object, such as a component, or a component has been exceeded or fallen below.
  • the predeterminable temperature is in particular one predefinable limit temperature.
  • the monitoring unit is thus preferably arranged such that they like
  • the detection unit can be arranged either together with the monitoring unit or, alternatively, be executed as a separate unit, which is used on demand. But also an integration of the detection unit in an electronic unit, such as a measuring device or in an electronic module is conceivable. Depending on the intended application, a monitoring of the predeterminable temperature can thus be carried out continuously, or the overshoot or undershoot of the predeterminable temperature can be checked as needed, for example at predeterminable times or at predeterminable time intervals.
  • the Ehrenfestklass Culture is a phase transition at least second order.
  • no or only a negligible amount of latent heat is released during the phase transition. If no or only a negligible amount of latent heat is released, it is advantageously possible, among other things, to ensure that the temperature measured by means of the temperature sensor at the time of occurrence of a phase transition does not, in particular not pass through, be independent of the selected classification for phase transitions liberated latent heat is distorted.
  • phase transitions Differentiated between phase transitions [s. z. B. Lexikon der Physik, Spektrum Akademischer Verlag Heidelberg Berlin, Volume 4 under the heading "phase transitions and other critical
  • a material remaining in the solid state is with regard to structural aspects of the system, in particular the
  • each reference element can have one or more phase transitions. It can therefore be monitored by means of a system and a plurality of predeterminable temperatures. For example, in the case of monitoring a determinable
  • a control signal can also be generated by means of which a safety function, for example a switch-off operation of a component or the like, is undertaken.
  • the material is a ferroelectric material, a ferromagnetic material, or a superconductor, in particular a high-temperature superconductor.
  • the at least one phase transition is accordingly a phase transition from the ferroelectric to the paraelectric state or vice versa, from the ferromagnetic state to the paramagnetic state or from the superconducting state to the normal conducting state or vice versa.
  • phase transition is fundamentally accompanied by the change of a specific material property.
  • material-specific changes for the material from which the respective reference element at least partially exists are known and can be used for monitoring the predeterminable temperature.
  • the characteristic physical or chemical characteristic is given by a dielectric, electrical or magnetic property of the material, for example by a magnetic or electrical polarization or remanence, by a capacitance or an inductance, or by a crystal structure or a Volume.
  • Capacitor element with a dielectric, wherein the dielectric of the
  • Capacitor element consists at least partially of the material, for which material at the predetermined phase transition temperature, the at least one phase transition occurs.
  • the reference element is a coil arrangement having at least one coil and a magnetically conductive body, the body consisting at least partially of the material for which material the at least one phase transition occurs at the predetermined phase transition temperature.
  • the at least one phase transition can be detected on the basis of an inductance or a variable dependent on the inductance.
  • the detection unit comprises means for detecting the change of a field emanating from the reference element, in particular an electric or magnetic field, wherein the detection unit is configured to the over- or
  • the polarization of the respective material which undergoes the phase transition may change. This is the case in particular with ferroelectric and ferromagnetic materials.
  • the means for detecting a change of the field comprise means for detecting a force or the change of a force.
  • a change in a force for example, a change in the polarization state of the respective material can be concluded in a simple manner.
  • a further embodiment includes that the detection unit and / or
  • Monitoring unit comprises means for applying a, in particular electrical, or magnetic field.
  • the means for applying the field are configured such that the field intersperses at least temporarily and at least partially at least one component of the reference element, in particular the at least one component which at least partially consists of the material for which the at least one phase transition occurs.
  • the field can be created manually, for example by a user of the system.
  • the field can also be created at predeterminable time intervals or continuously during the operation of the system.
  • the detection unit is designed to detect the overshoot or undershoot of the predeterminable temperature based on at least one hysteresis curve and / or based on a polarization.
  • At least the reference element and at least one further component of the monitoring unit and / or detection unit are at least temporarily part of an electrical resonant circuit, wherein the detection unit is configured to detect the occurrence of the phase transition of a change in a resonant frequency of the resonant circuit.
  • the system comprises a
  • Output unit which is designed to indicate the exceeding or falling below the predetermined temperature, output and / or transmitted to an external unit.
  • the output unit is associated with the detection unit, for example.
  • the system comprises a transmission unit, in particular a transmission unit comprising an RFID or a Bluetooth module, which
  • Transmission unit is configured for wireless transmission of at least the exceeding or falling below the predetermined temperature.
  • Transmission unit for example, the respective present resonance frequency to be transmitted. Likewise, based on the change of the resonance frequency a
  • Transmission property of the transmission unit for example, a transmission frequency or an excitation frequency, or excitation sensitivity, to be modified. This applies in particular to passive RFID modules.
  • An embodiment comprising a transmission unit is basically characterized by a particularly simple structural design.
  • the system further comprises a power supply unit for supplying at least one component of the monitoring unit, the detection unit, the output unit and / or the transmission unit by means of electrical energy.
  • the system, or at least one component of the system can therefore be configured in such a way that it operates autonomously from an external energy supply. This is particularly advantageous when the
  • Monitoring unit and detection unit are designed as separate units.
  • a mobile detection unit for detecting the occurrence of a
  • Phase transition can be used in multiple monitoring units.
  • the object according to the invention is further achieved by a monitoring unit for use in a system according to the invention, as well as by a detection unit for use in a system according to the invention.
  • the object according to the invention is achieved by a method for monitoring a predeterminable temperature by means of a system according to the invention, comprising the following method steps:
  • FIG. 1 shows a schematic representation of a system according to the invention with a monitoring unit and detection unit, which are arranged a) together and b) separated from each other,
  • FIG. 2 shows a schematic representation of the time characteristic of a characteristic parameter and of the temperature for illustrating the detection of the phase transition on the basis of a change in the parameter
  • FIG. 3 shows a schematic representation of an embodiment of the reference element as (a) capacitor element and (b) as coil arrangement
  • FIG. 4 illustrates the detection of a phase transition based on a change in the polarization of the material of which the reference element at least partially consists.
  • FIG. 5 illustrates the detection of a phase transition by means of a hysteresis curve, in the case of (a) ferroelectric and (b) a ferromagnetic phase transition
  • FIG. 6 illustrates the detection of a phase transition based on the resonant frequency of a resonant circuit with a reference element in the form of (a) inductance and (b) capacitance.
  • the system basically comprises a monitoring unit 2, which a
  • Reference element 3 which consists at least partially of a material for which material at a phase transition temperature T P h which
  • Phase transition temperature in the range of the predetermined temperature Tmin / max at least one phase transition occurs, for which phase transition the material remains in the solid phase.
  • the system 1 comprises a detection unit 4, with which the occurrence of the phase transition on the basis of a, in particular abrupt, change detects at least one characteristic of the reference element 3 physical or chemical characteristic and generates a message about exceeding or falling below the predetermined temperature Tmin / max become. This message can, for example, by means of an output unit. 5
  • the monitoring unit 2 and the detection unit 4 can be arranged either together, as shown in Fig. 1 a, or be configured separately as separate units, as illustrated in Fig. 1 b.
  • Monitoring unit 2 and the detection unit 4 can be done both wired and wireless accordingly.
  • the monitoring unit 2 with the reference element 3 is in direct contact with the detection unit 4, which in turn is in direct contact with an output unit 5.
  • the output unit 5 By means of the output unit 5, a message about exceeding or falling below the predefinable temperature Tmin / max is transmitted to the external unit 7 in this exemplary embodiment.
  • the system 1 according to FIG. 1 is designed substantially in the form of a single component.
  • the detection unit 4 is designed as an independent unit 8 in this embodiment.
  • This unit 8 comprises the detection unit 4, the output unit 5 and the transmission unit 6.
  • the unit 8 comprises a power supply unit 9 which supplies the detection unit 4, the output unit 5 and the transmission unit 6 with electric power.
  • the unit 8 is correspondingly self-sufficient from a power supply and can be used mobile.
  • the occurrence of the at least one phase transition is achieved according to the invention by means of a particularly abrupt change of at least one for the reference element 3 characteristic physical or chemical characteristic detected, as illustrated in Fig. 2.
  • the upper diagram shows the time profile of a characteristic physical or chemical quantity G used to detect the phase transition. If a phase transition takes place in the reference element 3, an abrupt change in the size G occurs in the example shown.
  • the point in time at which the abrupt change the size is detected is the phase transition time t P h at which the reference element 3 reaches the phase transition temperature T P h.
  • the lower diagram shows the temperature T as a function of the time t.
  • the material for which the phase transition occurs is chosen such that the phase transition temperature Tph is in the range of the predeterminable temperature Tmin / max, which is monitored.
  • Fig. 2 refers to the case that the predetermined temperature Tmin / max should not be exceeded. In this case, it makes sense to choose the material for the reference element 3 such that Tph ⁇ Tmin / max, depending on the application, a suitable temperature difference between the phase transition temperature T P h and the predetermined temperature Tmin / max is selectable.
  • the phase transition temperature T P h is first reached at a first time ti.
  • phase transition temperature T P h When the phase transition temperature T P h is reached, for example, a message is generated and output. Upon further heating, the predeterminable temperature Tmin / max would be reached at a second time t2.
  • Temperature Tmin / max should not fall below analogous considerations apply, so that this case is not discussed here in detail.
  • the temperature difference between the phase transition temperature T P h and the predeterminable temperature Tmin / max can be
  • Measuring medium, substance or mixture of substances, or the respective object, such as a component, or a component can be selected.
  • the material for the reference element 3 can also be selected such that the phase transition temperature T P h and the predeterminable temperature Tmin / max substantially correspond. In this case, the predetermined temperature interval is substantially zero.
  • FIG. 1 Some exemplary, possible embodiments for the reference element 3 are shown in FIG.
  • an embodiment of the reference element 3 in the form of a capacitor element is suitable.
  • the material 10 for which the phase transition occurs forms the dielectric in this case.
  • the reference element 3 further comprises two electrodes 1 1 a and 1 1 b, which in the example shown here directly on two opposite side surfaces of the material 10, which as substantially cubic Body is arranged, arranged and electrically contacted by two leads 1 1 a and 1 1 b, for example, to detect the capacitance C of the reference element 3 and to detect a particular sudden change in the capacitance C.
  • this embodiment of the reference element 3 in the form of a capacitor element reference is made to the published patent application DE102010040039A1.
  • FIGS. 3d An embodiment in the form of a coil arrangement is suitable, as shown by way of example in FIGS. 3d shown.
  • Embodiment of the reference element 3 consists in the detection of a change in the inductance L of the arrangement. In a phase transition from ferromagnetic to paramagnetic state, the magnetic resistance of the material 15, for which the
  • the reference element 3 comprises a coil 13 with core 14, and a magnetically conductive body 15, which consists of the ferromagnetic material.
  • the magnetically conductive body 15 is arranged such that it is at least partially in a magnetic field B emanating from the coil 13 with the core 14, which is illustrated by the drawing of field lines.
  • Phase transition in the magnetically conductive body 15 changes the magnetic field B, which is detectable for example by a change in the inductance L of the arrangement.
  • FIGS. 3b and 3c Two possible embodiments of the reference element 4 as a coil arrangement without a core are shown correspondingly in FIGS. 3b and 3c.
  • FIG. 3d on the one hand, on the one hand, the magnetic field Bi is shown, which prevails when the material 15 is in the ferromagnetic state.
  • the magnetic field B2 which prevails when the material 15 is in the paramagnetic state is plotted.
  • the material 15, the coil 13 and the core 14 need not necessarily be arranged together within the detection unit 4. It is also conceivable that the coil 13 and / or the core 14 is part / parts of the transmission unit 6 is / are.
  • the different reference elements 3 can each be configured identical or different.
  • materials with phase transitions come at different
  • at least one of the reference elements 3 in the form of a capacitor element and at least one other Reference element can be configured in the form of a coil arrangement.
  • the detection unit 4 may further comprise either one or more measuring circuits.
  • One way to detect the occurrence of a phase transition is to detect a change in the polarization of the respective material 10 or 15, for which the
  • Phase transition occurs, as illustrated with reference to FIG. 4.
  • Phase transition for example, the polarization of the material 10 or 15, for which the phase transition occurs, change.
  • a change in polarization can be any change in polarization.
  • the temperature T is shown as a function of time t.
  • a phase transition takes place at which the polarization of the material 10 or 15 disappears, as illustrated in FIGS. 4c and 4e.
  • the material 10 or 15 was in the ferromagnetic state in the case of FIG. 4c and in the ferroelectric state in the case of FIG. 4e.
  • the respective material is in the paramagnetic state in the case of FIG. 4c and in the paraelectric state in the case of FIG. 4e.
  • the respective material changes again into a ferromagnetic (FIG.
  • Another possibility for detecting a phase transition based on the polarization consists in the consideration of a field emanating from the reference element 3, for example the remanence of the respective material.
  • a field emanating from the reference element 3 for example the remanence of the respective material.
  • One of the material which is initially in a high polarization ferroelectric or ferromagnetic state will disappear after exceeding the phase transition temperature T P h.
  • An initial state high polarization of the particular ferroelectric or ferromagnetic material used for example, by applying a, in particular external, electrical or
  • a particular object such as electronic assemblies, or food, may, for example, during transport, a certain predetermined temperature Tmin / max never exceed.
  • a monitoring unit 2 comprising a reference element 3 with a ferroelectric or ferromagnetic material is attached to the respective object or in the immediate vicinity of the respective object.
  • the reference element 3 can be polarized at the beginning, for example, by applying a, in particular external electrical or magnetic field, which at least partially and / or partially passes through the material having the phase transition.
  • Detection unit 4 are designed as separate units.
  • Either the polarization of the respective object during transport by means of the detection unit 4 can be detected continuously or at predeterminable time intervals or time intervals.
  • the occurrence can then be detected on the basis of a, in particular abrupt, change in the polarization can then be detected on the occurrence of a phase transition in the respective material from which the reference element at least partially.
  • the occurrence of a phase transition can also be checked once, in particular at the end of a respective process, for example after a transport. In this case, for example, the polarizations can be compared at the beginning, ie in the initial state and at the end.
  • the reference element 3 can be polarized again by applying a suitable field.
  • Corresponding means for creating a field can be implemented, for example, in the monitoring unit 2 or in the detection unit 4.
  • a detection of the respective polarization by means of a suitably designed detection unit 4 can in principle be carried out, for example, based on the remanence.
  • the presence of a remanence or a polarization can be determined, for example, by means of a change in the capacitance or inductance, as shown in FIGS. 4b and 4d.
  • predetermined temperature Tmin / max to be checked at predetermined times.
  • an embodiment of the reference element corresponding to one of the embodiments from FIG. 5 is suitable, for example.
  • the monitoring unit 2 and the detection unit are arranged together.
  • the reference element 3 is part of an electrical circuit of the detection unit 4.
  • phase transition occurs by applying a time-dynamic voltage Udyn detected.
  • the respective hysteresis curve is obtained by applying the voltage Ui in each case as a function of Udyn.
  • the occurrence of a phase transition can be detected, for example, by means of a change in the ratio of the voltages Udyn and Ui.
  • the reference element 3 is a capacitor element with the capacitance C re f, as illustrated for example in FIG. 3 a.
  • the circuit comprising the detection unit 4 is a so-called sawyer tower circuit, which is well known in the art and therefore not described in detail here.
  • Reference element 3 in the form of a coil arrangement with the inductance L re f, such as in one of the figures Fig. 3b-Fig. 3d, which in each case comprises a ferromagnetic material, on the other hand is shown in FIG. 5b.
  • the capacitance Ci, as well as the resistors Ri and R2 are each adapted to the reference element 3 used.
  • Phase transition detected for example, based on a change in a resonant frequency fo of the resonant circuit. It should be noted, however, that other characteristics of the Resonant circuit, such as an attenuation, an amplitude response, or a frequency response can be evaluated in terms of the occurrence of a phase transition.
  • the monitoring unit 2 and the detection unit 4 are arranged together, wherein the reference element 3 is part of the respective resonant circuit, which is in each case integrated into the detection unit 4.
  • an RC resonant circuit with the resistor Ri is suitably selected as a function of the reference element 3.
  • an element of an RFID module can be advantageously integrated directly into the resonant circuit in this case.
  • the phase transition is then detected based on a change in the resonant frequency fo of the resonant circuit, which directly by means of
  • Transmission unit 6 is transmitted.
  • a transmission unit 6 is integrated into the resonant circuit.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

La présente invention concerne un système (1) destiné à surveiller une température déterminable (Tmin/max), comprenant une unité de surveillance (2) comprenant un élément de référence (3), l'élément de référence (3) étant composé au moins en partie d'un matériau (10, 15) pour lequel se produit au moins une transition de phase à une température de transition de phase (Tph), la température de transition de phase (Tph) se situant dans la plage de la température déterminée (Tmin/max), le matériau (10, 15) restant en phase solide pour la transition de phase, et une unité de détection (4), qui est conçue pour détecter l'apparition de la transition de phase à l'aide d'une variation, notamment brusque, d'au moins une grandeur caractéristique (G, Lref, Cref) physique ou chimique de l'élément de référence (3), et pour générer une notification en cas de valeur supérieure ou inférieure à la température déterminable (Tmin/max). En outre, la présente invention concerne une unité de surveillance (2) et une unité de détection (4) destinées à être utilisées dans un système selon l'invention (1) ainsi qu'un procédé destiné à surveiller la température déterminable (Tmin/max) au moyen d'un système selon l'invention (1).
EP17821512.5A 2017-01-09 2017-12-08 Transmetteur de valeur limite de température Ceased EP3566032A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017100266.9A DE102017100266A1 (de) 2017-01-09 2017-01-09 Temperatur-Grenzwertgeber
PCT/EP2017/082040 WO2018127357A1 (fr) 2017-01-09 2017-12-08 Transmetteur de valeur limite de température

Publications (1)

Publication Number Publication Date
EP3566032A1 true EP3566032A1 (fr) 2019-11-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP17821512.5A Ceased EP3566032A1 (fr) 2017-01-09 2017-12-08 Transmetteur de valeur limite de température

Country Status (5)

Country Link
US (1) US20190353529A1 (fr)
EP (1) EP3566032A1 (fr)
CN (1) CN110140035A (fr)
DE (1) DE102017100266A1 (fr)
WO (1) WO2018127357A1 (fr)

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DE102015112425A1 (de) * 2015-07-29 2017-02-02 Endress + Hauser Wetzer Gmbh + Co. Kg Verfahren und Vorrichtung zur in situ Kalibrierung eines Thermometers
DE102018121494A1 (de) 2018-09-04 2020-03-05 Endress + Hauser Wetzer Gmbh + Co Kg Messeinsatz mit Zustandsüberwachung
DE102019124588A1 (de) * 2019-09-12 2021-03-18 Biometra GmbH Temperiervorrichtung
IT202000001084A1 (it) * 2020-01-21 2021-07-21 Enea Agenzia Naz Per Le Nuove Tecnologie Lenergia E Lo Sviluppo Economico Sostenibile Indicatore di temperatura a risposta impedenziometrica integrabile in sistemi RFID HF in forma di transponder RFID con chip o chipless e metodo di realizzazione di tale indicatore di temperatura.
DE102020113903B3 (de) 2020-05-25 2021-11-18 Temperaturmeßtechnik Geraberg GmbH Thermoelement zur Messung hoher Temperaturen und Verfahren zur Drifterkennung an einem Thermoelement
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WO2018127357A1 (fr) 2018-07-12
CN110140035A (zh) 2019-08-16
US20190353529A1 (en) 2019-11-21

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